Locomotive-boiler



Model) I E. H. ASHCROFT.

LocomOti'vTBoiler.

No.235,400. I Pa ten ted Dec 14,1880.

ooooo ILPETERS, PHOTO-LITHOGRAPHER, WASHINGTON D C UNITE STATES PATENT()FFICE- EDWARD H. ASHCROFT, OF LYNN, MASSACHUSETTS.

LOCOMOTlVE-BOILER.

SPECIFICATION forming part of Letters Patent No. 235,400, dated December14, 1880,

Application filed March 31, 1880. (ModeL) To all whom it may concern Beit known that I, EDWARD H. ASHCROFT, of Lynn, county of Essex, and Stateof Massachusetts, have invented a new and useful Improvement inLocomotive-Boilers; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to theaccompanying drawings, forming a part of this specification, in whichFigure 1 represents a longitudinal vertical section; Figs. 2 and 3,transverse vertical sections, respectively onthe lines 3 y and ac x,- ofa boiler embodying my invention.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to certain improvements in locomotive-boilers forwhich Letters Patent of the United States were granted to me, asassignee, October 1, 1878, and numbered 208,546, in which an auxiliarysteam and water dome is arranged in conjunction with the main boiler andcommunicatingtherewith by a series of necks, said auxiliary dome andnecks hein g covered with a hood or casin g, forming an interiorsurrounding space, within which the productsof combustion are directedand circulated before escaping through the uptake-passage.

The improvements consist in providing an additional outlet for theproducts of combustion, located at or near the opposite or rear end ofthe hood or casing, and each outlet fitted with dampers to be opened orclosed alternately, whereby either outlet may be utilized for the escapeof thegases. The additional outlet at the rear end of the hood isintended to be utilized when the fires are started and during the timeemployed in getting up steam preparatory to a trip. The forward ordirect outlet being closed the products of combustion are returnedthrough the space surrounding the auxiliary dome. The draft of theboiler when in this stationary position is materially augmented, and theproducts of combustion are drawn in contact with the increasedheatingsurface presented by the auxiliary dome and necks, whichnecessarily induces a more rapid .the main portion of the boiler, B theauxiliary steam and water dome, and O the hood or casin g.

D is the forward uptake, located in the usual Way, and E the additionaluptake, arranged at the rear or opposite end of the hood 0.

It a are dampers or cut-offs arranged within the uptake-passages, and bthe connecting-rod for operating the same. As represented, the dampersare set and connected with the rod 1) at about right angles with eachother, so that a longitudinal movement of the rod will open one andclose the other, it being the intention to utilize but one of theuptake-passages at the same time, although both might be used if foundadvantageous, particularly when the engine is in motion, the change inrelative position of the dampers, in this instance, beingreadily'efi'ected by adjusting their attachment to the operatingconnecting-rod to secure such result.

0 0 represent hand-holes and plates, which may be located near the baseof the hood or casing, or wherever it may he found convenient to clearthe same of dirt or ashes or to gain access to its interior.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

In a locomotive-boiler substantially such as described, two or moreindependent uptakepassages for the escaping products of combustion,located at various parts of the hood or casing, with suitable devicesfor opening or closing the respective passages and utilizing either orboth, as set forth.

EDWARD H. ASHCROFT.

Witnesses:

Guns. W. FORBES, F. T. TAPLEY.

